Select the correct answer.

the chart gives the number of cases of pollo between 1937 and 2011. polio is an infectious disease that causes paralysis and sometimes death.
the pollo vaccine was introduced in 1955. what can be concluded about the polio vaccine?
a. it was successful eradicating polio from the united states.
b. it has no effect on the number of polio cases in the united states.
c. it reduced the number of polio cases, but deaths from polio stayed constant.
d. it initially lowered the number of polio cases, but the number of us cases remain high.

A is the correct option. Looking at the chart after the vaccine, the number of cases dropped drastically. It was officially declared eradicated in 1979 in the United States.

community or area create social relationships that typically differ greatly from the affiliations ultimate effects of travel experiences on the population in areas of origin, as well as in places of wage of only a dollar or two. motorcoach operators, museums, and restaurants fall into the broad category of public

explanation:

i'm sure the answer you are looking for would be

a. an ice age

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